Returns a MergeableStore that augments a Summingbird "online
store" with the ability to snapshot keys from the combined
online/offline ClientStore into some third presenting store every
time a key is touched.
TODO (https://github.com/twitter/summingbird/issues/73): Write a
version of this that accepts the most general presenting function:
(K, V) => Iterable[(K2, V2)] and move to Storehaus.
Returns a MergeableStore that augments a Summingbird "online store" with the ability to snapshot keys from the combined online/offline ClientStore into some third presenting store every time a key is touched.
TODO (https://github.com/twitter/summingbird/issues/73): Write a version of this that accepts the most general presenting function: (K, V) => Iterable[(K2, V2)] and move to Storehaus.